Table 2.
Multivariable-adjusted hazard ratios (95 % confidence intervals) for the development of metabolic syndrome, the Ryobi Health Survey 2009 – 2010 (n = 430)
| Cases (n) | Incident rate (per 1000 person-years) | Model 1 | Model 2 | Model 3 | Model 4 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HR | 95 % CI | p value | HR | 95 % CI | p value | HR | 95 % CI | p value | HR | 95 % CI | p value | |||
| Total sedentary time (≥1-min bout) | ||||||||||||||
| Q1 | 22 | 62.5 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
| Q2 | 23 | 68.0 | 1.23 | (0.63 – 2.39) | 0.542 | 1.39 | (0.67 – 2.86) | 0.376 | 1.37 | (0.66 – 2.82) | 0.398 | 1.50 | (0.73 – 3.09) | 0.272 |
| Q3 | 20 | 63.3 | 1.66 | (0.88 – 3.13) | 0.116 | 1.87 | (0.94 – 3.72) | 0.075 | 1.84 | (0.92 – 3.68) | 0.083 | 1.76 | (0.87 – 3.55) | 0.118 |
| Q4 | 18 | 56.6 | 1.12 | (0.56 – 2.21) | 0.752 | 1.30 | (0.61 – 2.76) | 0.500 | 1.26 | (0.59 – 2.69) | 0.559 | 1.55 | (0.70 – 3.43) | 0.278 |
| Non-prolonged sedentary time (<30-min bout) | ||||||||||||||
| Q1 | 16 | 52.6 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
| Q2 | 18 | 55.9 | 0.71 | (0.38 – 1.31) | 0.268 | 0.72 | (0.39 – 1.34) | 0.298 | 0.71 | (0.38 – 1.33) | 0.287 | 0.79 | (0.42 – 1.48) | 0.465 |
| Q3 | 27 | 81.3 | 0.82 | (0.45 – 1.48) | 0.500 | 0.82 | (0.45 – 1.51) | 0.520 | 0.81 | (0.44 – 1.49) | 0.491 | 1.09 | (0.59 – 2.03) | 0.785 |
| Q4 | 22 | 60.1 | 0.85 | (0.47 – 1.52) | 0.573 | 0.85 | (0.47 – 1.56) | 0.606 | 0.83 | (0.45 – 1.52) | 0.546 | 1.08 | (0.57 – 2.02) | 0.817 |
| Prolonged sedentary time (≥30-min bout) | ||||||||||||||
| Q1 | 20 | 58.3 | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
| Q2 | 23 | 70.6 | 2.58 | (1.24 – 5.37) | 0.011 | 2.71 | (1.29 – 5.68) | 0.009 | 2.72 | (1.30 – 5.73) | 0.008 | 3.03 | (1.42 – 6.49) | 0.004 |
| Q3 | 21 | 64.4 | 2.16 | (1.02 – 4.59) | 0.045 | 2.41 | (1.11 – 5.25) | 0.026 | 2.42 | (1.11 – 5.25) | 0.026 | 2.25 | (1.03 – 4.92) | 0.040 |
| Q4 | 19 | 57.8 | 2.49 | (1.18 – 5.24) | 0.017 | 2.86 | (1.31 – 6.21) | 0.008 | 2.85 | (1.31 – 6.18) | 0.008 | 2.90 | (1.30 – 6.44) | 0.009 |
HR hazard ratio, CI confidence interval. Sedentary variables were adjusted for time spent wearing the device using the residual method prior to classifying into sex-specific quartiles. Model 1 was adjusted for sex and age. Model 2 was adjusted for sex, age, education, smoking, and family income. Model 3 was additionally adjusted for moderate-to-vigorous physical activity. Model 4 was additionally adjusted for waist circumference. Cut-offs for quartiles were 106.7, 165.5, and 269.2 min/day for men, and 65.1, 122.7, and 195.4 for women among those who wore the accelerometer device for the average amount of wear-time